4.6 sec in total
1.1 sec
3.3 sec
222 ms
Click here to check amazing Jdbk content for Germany. Otherwise, check out these important facts you probably never knew about jdbk.de
Joseph-DuMont-Berufskolleg Köln - selbstorganisiert und mediengestützt lernen an einer guten, gesunden Schule
Visit jdbk.deWe analyzed Jdbk.de page load time and found that the first response time was 1.1 sec and then it took 3.5 sec to load all DOM resources and completely render a web page. This is a poor result, as 60% of websites can load faster.
jdbk.de performance score
name
value
score
weighting
Value7.0 s
1/100
10%
Value13.2 s
0/100
25%
Value10.6 s
7/100
10%
Value500 ms
58/100
30%
Value0.114
86/100
15%
Value16.8 s
5/100
10%
1059 ms
500 ms
605 ms
497 ms
196 ms
Our browser made a total of 34 requests to load all elements on the main page. We found that 94% of them (32 requests) were addressed to the original Jdbk.de, 6% (2 requests) were made to Google-analytics.com. The less responsive or slowest element that took the longest time to load (1.6 sec) belongs to the original domain Jdbk.de.
Page size can be reduced by 480.1 kB (47%)
1.0 MB
535.5 kB
In fact, the total size of Jdbk.de main page is 1.0 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 15% of websites need less resources to load. Javascripts take 482.1 kB which makes up the majority of the site volume.
Potential reduce by 14.4 kB
HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 14.4 kB or 71% of the original size.
Potential reduce by 102.2 kB
Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Obviously, Jdbk needs image optimization as it can save up to 102.2 kB or 22% of the original volume. The most popular and efficient tools for JPEG and PNG image optimization are Jpegoptim and PNG Crush.
Potential reduce by 327.8 kB
It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 327.8 kB or 68% of the original size.
Potential reduce by 35.7 kB
CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Jdbk.de needs all CSS files to be minified and compressed as it can save up to 35.7 kB or 82% of the original size.
Number of requests can be reduced by 13 (39%)
33
20
The browser has sent 33 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Jdbk. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 8 to 1 for JavaScripts and from 7 to 1 for CSS and as a result speed up the page load time.
jdbk.de
1059 ms
modal.css
500 ms
mootools-core.js
605 ms
core.js
497 ms
caption.js
196 ms
mootools-more.js
629 ms
modal.js
253 ms
general.css
370 ms
main.css
557 ms
moomenuh.css
549 ms
nav.css
673 ms
template.css
675 ms
dynamic_css.php
728 ms
UvumiDropdown.js
734 ms
js_compress.php
883 ms
ga.js
18 ms
background.jpg
115 ms
schullogo2_blau_einzeilig_web_75x.png
1045 ms
sbb-koeln-logo.png
204 ms
schulengel_20.gif
741 ms
facebooklogo_20.jpg
743 ms
twitterlogo_20.png
781 ms
logobug1.png
731 ms
start00.jpg
1551 ms
balkenblau.png
1203 ms
moodle_aktuell.PNG
1114 ms
handel.jpg
1099 ms
Projekte16.jpg
1090 ms
PX.jpg
1304 ms
__utm.gif
13 ms
underline.png
1139 ms
arrow.png
1377 ms
puce_top_menu.gif
1152 ms
logo_joomla3.png
1183 ms
jdbk.de accessibility score
ARIA
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
Impact
Issue
[aria-hidden="true"] elements contain focusable descendents
Contrast
These are opportunities to improve the legibility of your content.
Impact
Issue
Background and foreground colors do not have a sufficient contrast ratio.
Navigation
These are opportunities to improve keyboard navigation in your application.
Impact
Issue
Heading elements are not in a sequentially-descending order
Names and labels
These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.
Impact
Issue
Links do not have a discernible name
Tables and lists
These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Impact
Issue
Lists do not contain only <li> elements and script supporting elements (<script> and <template>).
jdbk.de best practices score
Trust and Safety
Impact
Issue
Does not use HTTPS
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks
User Experience
Impact
Issue
Serves images with low resolution
General
Impact
Issue
Detected JavaScript libraries
jdbk.de SEO score
Mobile Friendly
Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).
Impact
Issue
Document uses legible font sizes
Tap targets are not sized appropriately
DE
DE
UTF-8
Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Jdbk.de can be misinterpreted by Google and other search engines. Our service has detected that German is used on the page, and it matches the claimed language. Our system also found out that Jdbk.de main page’s claimed encoding is utf-8. Use of this encoding format is the best practice as the main page visitors from all over the world won’t have any issues with symbol transcription.
jdbk.de
Open Graph description is not detected on the main page of Jdbk. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: